fix context

pkg/agent/loop_compaction_test.go

@@ -0,0 +1,60 @@
+package agent
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"clawgo/pkg/providers"
+)
+
+func TestShouldCompactBySize(t *testing.T) {
+	history := []providers.Message{
+		{Role: "user", Content: strings.Repeat("a", 80)},
+		{Role: "assistant", Content: strings.Repeat("b", 80)},
+	}
+
+	if !shouldCompactBySize("", history, 120) {
+		t.Fatalf("expected size-based compaction trigger")
+	}
+	if shouldCompactBySize("", history, 10000) {
+		t.Fatalf("did not expect trigger for large threshold")
+	}
+}
+
+func TestFormatCompactionTranscript_HeadTailWhenOversized(t *testing.T) {
+	msgs := make([]providers.Message, 0, 30)
+	for i := 0; i < 30; i++ {
+		msgs = append(msgs, providers.Message{
+			Role:    "user",
+			Content: fmt.Sprintf("msg-%02d %s", i, strings.Repeat("x", 80)),
+		})
+	}
+
+	out := formatCompactionTranscript(msgs, 700)
+	if out == "" {
+		t.Fatalf("expected non-empty transcript")
+	}
+	if !strings.Contains(out, "msg-00") {
+		t.Fatalf("expected head messages preserved, got: %q", out)
+	}
+	if !strings.Contains(out, "msg-29") {
+		t.Fatalf("expected tail messages preserved, got: %q", out)
+	}
+	if !strings.Contains(out, "messages omitted for compaction") {
+		t.Fatalf("expected omitted marker, got: %q", out)
+	}
+	if len(out) > 700 {
+		t.Fatalf("expected output <= max chars, got %d", len(out))
+	}
+}
+
+func TestFormatCompactionTranscript_TrimsToolPayloadMoreAggressively(t *testing.T) {
+	msgs := []providers.Message{
+		{Role: "tool", Content: strings.Repeat("z", 2000)},
+	}
+	out := formatCompactionTranscript(msgs, 2000)
+	if len(out) >= 1200 {
+		t.Fatalf("expected tool content to be trimmed aggressively, got length %d", len(out))
+	}
+}